diff --git a/meta/conf/machine/include/riscv/tune-riscv.inc b/meta/conf/machine/include/riscv/tune-riscv.inc
index b31d903172..76c7dad713 100644
--- a/meta/conf/machine/include/riscv/tune-riscv.inc
+++ b/meta/conf/machine/include/riscv/tune-riscv.inc
@@ -15,7 +15,8 @@ RISCV_PKGARCH_RVA22 = "rva22u64_zifencei"
 # (they lack the 'v' extension) but rva23 is, so split it out for comprehension.
 RISCV_PKGARCH_GCV = "riscv64imafdcv_zicsr_zifencei"
 
-# Linux kernel requires it, so add it on top of the profile's extensions.
+# zifencei isn't a mandatory extension in these profiles, but the Linux
+# kernel requires it, so add it on top of the profile's extensions.
 TUNE_FEATURES:tune-rva20u64 := "${@oe.tune.riscv_isa_to_tune("rva20u64")} zifencei"
 PACKAGE_EXTRA_ARCHS:tune-rva20u64 = "${RISCV_PKGARCH_GC} ${TUNE_RISCV_PKGARCH}"